#503D78
Closest named color: Dark Slate Blue (#483D8B). oklch(40.9% 0.097 296.7), rgb(80, 61, 120).
Aa
White text reads best on this color (9.21:1).
About this color
#503D78 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.097 and its hue 297°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.035 away. White text reads best on it, at 9.21:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.097) |
| Temperature | in between |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.27:1 |
| White text | 9.21:1 |
Values
| HEX | #503D78 |
| RGB | rgb(80, 61, 120) |
| HSL | hsl(259, 33%, 35%) |
| OKLCH | oklch(40.9% 0.097 296.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #503D78 | 9.21:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #503D78 | 2.27:1 | Fails | Lc 12.9 | Not readable |
| #503D78 text on white | 9.21:1 | AAA | Lc 91.1 | Preferred for body text |
| #503D78 text on black | 2.27:1 | Fails | Lc -11.3 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#F6F4FA
oklch(97% 0.008 301.4)
-
Step 100
100
#EBE8F4
oklch(93.7% 0.016 297.5)
-
Step 200
200
#DBD5EC
oklch(88.5% 0.032 297.7)
-
Step 300
300
#C4BAE2
oklch(81% 0.057 296.6)
-
Step 400
400
#A695D3
oklch(70.7% 0.091 296.6)
-
Step 500
500
#917AC7
oklch(63.2% 0.115 296.7)
-
Step 600
600
#7B61B4
oklch(55.5% 0.127 296.5)
-
Step 700
700
#68509B
oklch(49.1% 0.118 296.6)
-
Step 800
800 (this color)
#503D78
oklch(40.9% 0.097 296.7)
-
Step 900
900
#463865
oklch(37.7% 0.076 296.9)
-
Step 950
950
#29213B
oklch(27% 0.048 297.2)
#503D78 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #2A487A | 0.060 |
| Deuteranopia (no green cones) | #2E4777 | 0.056 |
| Tritanopia (no blue cones) | #474854 | 0.078 |
| Achromatopsia (no color) | #484848 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #503D78
#503D78
oklch(40.9% 0.097 296.7)
- #475000
#475000
oklch(40.9% 0.094 116.9)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #503D78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.035
- Blueberry #464196 ΔE 0.052
- Twilight #4E518B ΔE 0.058
- Dusk #4E5481 ΔE 0.064
- Rebecca Purple #663399 ΔE 0.072
- Cobalt #1E488F ΔE 0.076
- Dusty Grape #545775 ΔE 0.078
- Dusk Blue #26538D ΔE 0.079
Use #503D78 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.